.page {
    width: 750px;
    margin: auto;
}

h2 {
    text-align: center;
}

.showIt {
    display: block;
}

.showNone {
    display: none;
}

.input {
    display: block;
    margin: auto;
    width: 600px;
    height: 50px;
    padding-left: 20px;
    outline: none;
}
.list {
    line-height: 50px;position: relative;
}

button {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    background-color: red;
    color: #fff;
}
.item{
    margin-left: 20px;
}